The wining percentage from jackpots is very less and if we try the jackpot on any new site, then it is almost useless because a new site will never give big amounts to its players. Even if you want to try out the jackpot, try it from the old sites which are there from many years and you might have some chances to win jackpot on such trusted sites.
I am not saying whether we have low or high jackpot in newer gambling sites. I am saying that new gambling sites are more risky to invest in jackpot as they might scam you and never let u withdraw even if you win the jackpot.